CN2715417Y - Journal bearing type electrical main shaft - Google Patents
Journal bearing type electrical main shaft Download PDFInfo
- Publication number
- CN2715417Y CN2715417Y CN 200420068396 CN200420068396U CN2715417Y CN 2715417 Y CN2715417 Y CN 2715417Y CN 200420068396 CN200420068396 CN 200420068396 CN 200420068396 U CN200420068396 U CN 200420068396U CN 2715417 Y CN2715417 Y CN 2715417Y
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- China
- Prior art keywords
- bearing
- main shaft
- ring
- floating ring
- motor stator
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- Expired - Fee Related
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Abstract
The utility model discloses a slide bearing type electrical main shaft, which aims at providing a high-speed accurate slide bearing type electrical main shaft with reasonable structure, favorable assembly/maintenance technical performance and excellent main shaft rigidity to obtain high speed and accurateness. The slide bearing type electrical main shaft comprises a main shaft (6), a motor stator (7), a motor rotor (8), a front and a back bearings (4), (11) and a casing (5). The front and the back bearings (4), (11) are supported on both ends of the main shaft (6). The slide bearing type electrical main shaft is characterized in that the front bearing (4) and the back bearing (11) are slide bearings; a front float ring (3) is equipped between the front bearing (4) and the main shaft (6); a back float ring (12) is equipped between the back bearing (11) and the main shaft (6); the motor stator (7) and the motor rotor (8) are equipped between the front bearing (4) and the back bearing (11), and the cable (19) of the motor stator (7) threads out of the casing (5). The utility model is mainly applied to high-speed precision finishing machine tools.
Description
Technical field:
The utility model belongs to mechanical manufacturing field, is specifically related to a kind of architecture advances of high-speed and precise electric main shaft.
Background technology:
With high cutting speed, high feed speed, high manufacturing accuracy is that the High-speed machining of principal character is one of four big advanced manufacturing technologies in the present age, is to make manufacturing technology produce the new and high technology that revolutionary character for the second time leaps continue Numeric Control Technology after.It not only has high productivity ratio, and can improve the machining accuracy and the surface quality of part significantly.The high-speed and precise electric main shaft is as the Core Feature parts in the High-speed NC Machining lathe, and the height of its performance directly has influence on the overall development level of high-speed processing machine tool.
The high-speed and precise electric main shaft is a kind of high-tech product that directly depends on the height electromechanical integration of technology such as bearing technology, accurate manufacturing and assembling.Its characteristics are, the function and the machine tool chief axis function of motor combined together from structure, have saved complicated middle transmission link, but have speed-regulating range width, the little Fast starting of moment of inertia and parking, be easy to realize advantages such as stepless speed regulation and accurate control.Along with the modern times equipment, manufacturing industry is to the develop rapidly of high-speed, high accuracy, high efficiency direction, performance requirement to the machine tool chief axis unit is more and more higher, and electric main shaft just progressively replaces traditional belt driven type mechanical main shaft, becomes the main flow structure of modern machine main shaft.
The bearing of high-speed and precise electric main shaft comprises magnetic suspension bearing, air bearing, rolling bearing and liquid sliding bearing etc.Wherein, magnetic suspension bearing rotating speed height, it is little to wear and tear, but since its control system complexity, the cost height, and its practicality as machine tool chief axis is restricted.Air bearing has the rotating speed height, and it is little to wear and tear, advantage of high precision, but, can only be used for the small-power main shaft of small cutting force processing because its rigidity is little, and bearing capacity is limited.Rolling bearing is the main support structure of present machine tool chief axis, have the speed height, simple in structure, can produce in batches, can integral replacing when keeping in repair etc. advantage, but there are two intrinsic deficiencies: the one, because rolling bearing is a high-frequency rotary work under contact condition, there are fretting wear and fatigue wear inevitably, useful life is shorter, after work a period of time, must take main shaft apart and keep in repair; And because the maintenance of main shaft and matching requirements maintenance personal's technological level is very high, maintenance or replacing main shaft need spend more time and cost, have reduced the production operation efficiency of lathe.The 2nd, because rolling bearing is to rely on the rigidity contact of limited rolling element that bearing capacity is provided, the local stress that raceway and ball touch inside and outside bearing is very high, and the local stress that does not touch is less, is certainly existing in a circumferential direction to be out of shape uneven phenomenon.Therefore adopt rolling bearing not to be suitable for machining accuracy and surface smoothness are required very high occasion, as precision grinder, fine boring machine etc. as the machine tool chief axis that supports.
Liquid sliding bearing is because the effect that bearing capacity is strong, lubricant medium has damping vibration attenuation and " homogenizing " error, therefore adopt liquid sliding bearing as the machine tool chief axis good rigidly, the rotating accuracy height that support, be very suitable for spindle unit as precision machine tool such as precision grinder and fine boring machine.But liquid sliding bearing exists shortcomings such as liquid medium frictional dissipation height, bearing temperature rise height, thereby causes adopting liquid sliding bearing lower as the working speed of the machine tool chief axis that supports.Simultaneously, be connected for interference owing to adopt between front and back bearings and the main shaft housing of main shaft of liquid sliding bearing, usually cause two kinds of rough sledding to occur: if the stator that bearing is installed motor is again installed by 1 elder generation, because motor stator cylindrical radial dimension is greater than the brearing bore size, motor stator can not directly be packed between the two bearings, can only place the rear portion of the main shaft outside the two bearings, becomes motor postposition formula main shaft, cause the main shaft axial dimension excessive, make the rigidity variation of front-end of spindle; 2 if pack motor stator between the two bearings into, the housing rear portion of again rear bearing being packed into behind the housing of must earlier motor stator being packed into during installation, when motor stator needs repairing replacing, the rear bearing that must be connected with the housing interference takes out earlier, could take out motor stator, because motor stator is connected the structure that no longer splits that is generally " cover is dead " with the interference of housing, implement very difficulty of dismounting.
The employing liquid sliding bearing owing to there is above-mentioned defective, causes it to fail at present fully to be used on lathe as the electric main shaft that supports, and fails to realize the production in enormous quantities of sliding bearing formula electricity main shaft as the Elementary Function parts.
The utility model content
Technical problem to be solved in the utility model is the defective that overcomes above-mentioned prior art, a kind of rational in infrastructure, good, main shaft good rigidly of assembling maintenance process is provided, can realizes the sliding bearing formula electricity main shaft of high speed, precise treatment.
For solving the problems of the technologies described above, the technical scheme that the utility model adopted is: it comprises main shaft, motor stator, rotor, fore bearing, rear bearing and housing, forward and backward bearing is supported on the main shaft two ends, it is characterized in that described fore bearing and rear bearing are sliding bearing, between fore bearing and main shaft, be provided with preceding floating ring, be provided with the back floating ring between rear bearing and the main shaft, motor stator and rotor place between fore bearing and the rear bearing, and the cable of motor stator passes to the outside by the hole on the housing.
As further improvement of the utility model, described housing is combined by front-end bearing pedestal and rear bearing block, and both are fastenedly connected by securing member.
Described fore bearing places the front end of front-end bearing pedestal, and the flange location of making axial location by this bearing front end setting, motor stator places the rear end of front-end bearing pedestal, rear bearing places rear bearing block, and the flange location of making axial location that is provided with by this bearing rear end, be provided with the motor stator locating ring in the motor stator rear end, this motor stator locating ring is fastening by securing member and motor stator and front-end bearing pedestal, the front end of floating ring is provided with a flange of making axial limiting before described, the rear end of back floating ring is provided with the flange of making axial limiting, front end at front-end bearing pedestal is provided with front end housing, floating ring thrust adjusting pad before being provided with between front end housing and the fore bearing, outside the floating ring flange excircle, front end housing and preceding floating ring thrust adjusting pad were anchored on the front-end bearing pedestal before floating ring thrust adjusting pad was sheathed on before described; Floating ring rear end, described back is provided with retainer ring, between rear bearing and retainer ring, be provided with back floating ring thrust adjusting pad, described back floating ring thrust adjusting pad is sheathed on outside the floating ring flange excircle of back, be provided with the main shaft thrust ring in the retainer ring rear end, described main shaft thrust ring is fixed on the main shaft by locking nut, be provided with the rear end cap that is fastenedly connected with rear bearing block in the rear end of rear bearing block, be provided with main shaft thrust ring adjusting pad between rear end cap and the retainer ring, described main shaft thrust ring adjusting pad is sheathed on outside the excircle of main shaft thrust ring.
Sliding bearing formula electricity main shaft of the present utility model, adopt the sliding supported condition main shaft, and between sliding bearing and main shaft, floating ring is set, form floating ring formula sliding bearing, during main axis rotation, between the inner ring surface of floating ring and the main shaft periphery, all be full of between the outer ring surface of floating ring and the bearing bush lubricant medium arranged, floating ring rotates under the drive of the lubricant medium that main shaft drives.The absolute rotary speed of main shaft is a main shaft with respect to the rotary speed of annulus and the annulus rotary speed sum with respect to bearing shell, therefore under same absolute speed conditions, the speed of the inside and outside oil film of floating ring formula sliding bearing is starkly lower than the speed of the oil film in the traditional sliding bearing that does not adopt floating ring.Because speed reduces to cause frictional dissipation to reduce, temperature rise reduces naturally.In other words, under same temperature condition, adopt floating ring formula main shaft can realize higher working speed, realize the main shaft high speed.And, because traditional single sliding bearing has become the combined bearing of being made up of floating ring and sliding bearing, can split installation, made things convenient for the assembly and disassembly of bearing and main shaft and motor stator.
The utility model can be made housing the split-type structure, be divided into dismountable forward and backward bearing pedestal, the rotor that can realize motor more easily places the electric main axle structure between two sliding bearings, make installation, location and the dismounting of motor stator easy to maintenance, the assembling maintenance process is good, rational in infrastructure, the main shaft good rigidly.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Each label is represented among the figure:
1, front end housing 2, preceding floating ring thrust adjusting pad
3, preceding floating ring 31, flange
4, fore bearing 41, flange
5, housing 51, front-end bearing pedestal
52, rear bearing block 6, main shaft
7, motor stator 8, rotor
9, motor stator locating ring 11, rear bearing
111, flange 12, back floating ring
121, flange 13, back floating ring thrust adjusting pad
14, retainer ring 15, main shaft thrust ring
16, locking nut 17, main shaft thrust ring adjusting pad
18, rear end cap 19, cable
Embodiment
As shown in Figure 1, sliding bearing formula electricity main shaft of the present utility model, comprise main shaft 6, motor stator 7, rotor 8, fore bearing 4, rear bearing 11 and housing 5, forward and backward bearing 4,11 is supported on main shaft 6 two ends, fore bearing 4 and rear bearing 11 are sliding bearing, floating ring 3 before between fore bearing 4 and main shaft 6, being provided with, be provided with back floating ring 12 between rear bearing 11 and the main shaft 6, form floating ring formula sliding bearing, motor stator 7 and rotor 8 place between fore bearing 4 and the rear bearing 11, and the cable 19 of motor stator 7 passes to housing 5 outsides from housing 5.Between the inner ring surface of forward and backward floating ring 3,12 and main shaft 6 peripheries, all be full of between the outer ring surface of forward and backward floating ring 3,12 and forward and backward bearing 4,11 bearing shells lubricant medium arranged, main shaft 6 rotations, drive the liquid medium rotation between main shaft 6 and the forward and backward floating ring 3,12, liquid medium drives forward and backward floating ring 3,12 rotations, and forward and backward floating ring 3,12 drives the liquid medium rotation between floating ring 3,12 and the forward and backward bearing 4,11.Form relative rotary motion between main shaft 6 and the forward and backward floating ring 3,12.The absolute rotary speed of main shaft 6 is main shafts 6 with respect to the rotary speed of forward and backward floating ring 3,12 and forward and backward floating ring 3, the 12 rotary speed sum with respect to forward and backward bearing 4,11 bearing shells, therefore under same absolute speed conditions, the speed of the inside and outside oil film of floating ring formula sliding bearing is starkly lower than the speed of the oil film in the traditional sliding bearing that does not adopt floating ring.Because speed reduces to cause frictional dissipation to reduce, temperature rise reduces naturally.In other words, under same temperature condition, adopt floating ring formula main shaft can realize higher working speed.
Claims (3)
1, a kind of sliding bearing formula electricity main shaft, comprise main shaft (6), motor stator (7), rotor (8), fore bearing (4), rear bearing (11) and housing (5), before, rear bearing (4), (11) be supported on main shaft (6) two ends, it is characterized in that described fore bearing (4) and rear bearing (11) are sliding bearing, between fore bearing (4) and main shaft (6), be provided with preceding floating ring (3), be provided with back floating ring (12) between rear bearing (11) and the main shaft (6), motor stator (7) and rotor (8) place between fore bearing (4) and the rear bearing (11), and the cable (19) of motor stator (7) passes to the outside from housing (5).
2, sliding bearing formula electricity main shaft according to claim 1 is characterized in that described housing (5) is combined by front-end bearing pedestal (51) and rear bearing block (52), and both are fastenedly connected by securing member.
3, sliding bearing formula electricity main shaft according to claim 2, it is characterized in that described fore bearing (4) places the front end of front-end bearing pedestal (51), and the location of the flange of making axial location (41) by this bearing front end setting, motor stator (7) places the rear end of front-end bearing pedestal (51), rear bearing (11) places rear bearing block (52), and the flange of making axial location (111) location that is provided with by this bearing rear end, be provided with motor stator locating ring (9) in motor stator (7) rear end, this motor stator locating ring (9) is fastening by securing member and motor stator (7) and front-end bearing pedestal (51), the front end of floating ring (3) is provided with a flange (31) of making axial limiting before described, the rear end of back floating ring (12) is provided with the flange (121) of making axial limiting, front end at front-end bearing pedestal (51) is provided with front end housing (1), floating ring thrust adjusting pad (2) before being provided with between front end housing (1) and the fore bearing (4), outside floating ring flange (31) excircle, front end housing (1) and preceding floating ring thrust adjusting pad (2) were anchored on the front-end bearing pedestal (51) before floating ring thrust adjusting pad (2) was sheathed on before described; Floating ring (12) rear end, described back is provided with retainer ring (14), between rear bearing (11) and retainer ring (14), be provided with back floating ring thrust adjusting pad (13), described back floating ring thrust adjusting pad (13) is sheathed on outside floating ring flange (121) excircle of back, be provided with main shaft thrust ring (15) in retainer ring (14) rear end, described main shaft thrust ring (15) is fixed on the main shaft (6) by locking nut (16), be provided with the rear end cap (18) that is fastenedly connected with rear bearing block (52) in the rear end of rear bearing block (52), be provided with main shaft thrust ring adjusting pad (17) between rear end cap (18) and the retainer ring (14), described main shaft thrust ring adjusting pad (17) is sheathed on outside the excircle of main shaft thrust ring (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420068396 CN2715417Y (en) | 2004-08-11 | 2004-08-11 | Journal bearing type electrical main shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420068396 CN2715417Y (en) | 2004-08-11 | 2004-08-11 | Journal bearing type electrical main shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2715417Y true CN2715417Y (en) | 2005-08-03 |
Family
ID=34873742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420068396 Expired - Fee Related CN2715417Y (en) | 2004-08-11 | 2004-08-11 | Journal bearing type electrical main shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2715417Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293971C (en) * | 2004-08-09 | 2007-01-10 | 湖南大学 | Sliding bearing type electric main shaft |
| CN107863829A (en) * | 2017-12-25 | 2018-03-30 | 沈阳工业大学 | Single stator and double-rotor motor in axial magnetic field stator and casing mounting structure |
-
2004
- 2004-08-11 CN CN 200420068396 patent/CN2715417Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293971C (en) * | 2004-08-09 | 2007-01-10 | 湖南大学 | Sliding bearing type electric main shaft |
| CN107863829A (en) * | 2017-12-25 | 2018-03-30 | 沈阳工业大学 | Single stator and double-rotor motor in axial magnetic field stator and casing mounting structure |
| CN107863829B (en) * | 2017-12-25 | 2024-03-05 | 沈阳工业大学 | Stator and shell mounting structure of single-stator double-rotor axial magnetic field motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |